Start adding a chest gui system

src/main/java/dev/zontreck/libzontreck/chestgui/ChestGUI.java

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+package dev.zontreck.libzontreck.chestgui;
+
+import dev.zontreck.libzontreck.LibZontreck;
+import dev.zontreck.libzontreck.networking.packets.ChestGUIOpenC2S;
+import dev.zontreck.libzontreck.vectors.Vector2;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.item.Item;
+import net.minecraftforge.fml.LogicalSide;
+import net.minecraftforge.items.ItemStackHandler;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class ChestGUI
+{
+    private ItemStackHandler container = new ItemStackHandler((9*3));
+    private String MenuTitle;
+    private UUID player;
+    private List<ChestGUIButton> buttons = new ArrayList<>();
+    private ResourceLocation id;
+    public ChestGUI withButton(ChestGUIButton button)
+    {
+        buttons.add(button);
+        container.setStackInSlot(button.getSlotNum(), button.buildIcon());
+
+        return this;
+    }
+
+    public ChestGUI withTitle(String title)
+    {
+        MenuTitle = title;
+
+        return this;
+    }
+
+    public static ChestGUI builder()
+    {
+        return new ChestGUI();
+    }
+
+    public ChestGUI withPlayer(UUID id)
+    {
+        player=id;
+        return this;
+    }
+
+    /**
+     * Open the GUI on the client
+     */
+    public void open()
+    {
+        if(LibZontreck.CURRENT_SIDE == LogicalSide.SERVER)
+        {
+
+        }
+    }
+
+    public boolean isPlayer(UUID ID)
+    {
+        return player.equals(ID);
+    }
+
+    public ChestGUI withGUIId(ResourceLocation id)
+    {
+        this.id = id;
+        return this;
+    }
+
+    public boolean matches(ResourceLocation id)
+    {
+        return this.id.equals(id);
+    }
+
+    public void handleButtonClicked(int slot, Vector2 pos, Item item) {
+        for(ChestGUIButton button : buttons)
+        {
+            if(button.getSlotNum() == slot)
+            {
+                if(button.buildIcon().getItem() == item)
+                {
+                    button.clicked();
+                    return;
+                }
+            }
+        }
+    }
+}

src/main/java/dev/zontreck/libzontreck/chestgui/ChestGUIButton.java

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+package dev.zontreck.libzontreck.chestgui;
+
+import dev.zontreck.libzontreck.lore.LoreContainer;
+import dev.zontreck.libzontreck.lore.LoreEntry;
+import dev.zontreck.libzontreck.util.ChatHelpers;
+import dev.zontreck.libzontreck.vectors.Vector2;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtUtils;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ChestGUIButton
+{
+    private Item icon;
+    private String name;
+    private List<LoreEntry> tooltipInfo;
+
+    private Runnable callback;
+    private CompoundTag NBT = new CompoundTag();
+
+    /**
+     * Position is Row (X), Column (Y)
+     */
+    private Vector2 position;
+
+    public ChestGUIButton(Item icon, String name, Runnable callback, Vector2 position)
+    {
+        this.icon = icon;
+        this.name = name;
+        this.callback = callback;
+        this.position = position;
+        tooltipInfo = new ArrayList<>();
+    }
+
+    public ChestGUIButton(ItemStack existing, Runnable callback, Vector2 position)
+    {
+        this.callback = callback;
+        this.position = position;
+
+        LoreContainer container = new LoreContainer(existing);
+        tooltipInfo = container.miscData.LoreData;
+        name = existing.getHoverName().getString();
+        icon = existing.getItem();
+        NBT = existing.getTag();
+
+    }
+
+    public ChestGUIButton withNBT(CompoundTag tag)
+    {
+        this.NBT = tag;
+        return this;
+    }
+
+    public ItemStack buildIcon()
+    {
+        ItemStack ret = new ItemStack(icon,1);
+        ret = ret.setHoverName(ChatHelpers.macro(name));
+
+        LoreContainer cont = new LoreContainer(ret);
+
+        for (LoreEntry str : tooltipInfo)
+        {
+            cont.miscData.LoreData.add(str);
+        }
+
+        cont.commitLore();
+
+        NBT.putInt("slot", getSlotNum());
+        NBT.put("pos", position.serialize());
+
+        ret.setTag(NBT);
+
+        return ret;
+    }
+
+    /**
+     * Adds a line to the Lore (Tooltip) of the button
+     * @param line The line to add
+     * @return ChestGUIButton instance
+     */
+    public ChestGUIButton withInfo(LoreEntry line)
+    {
+        tooltipInfo.add(line);
+
+        return this;
+    }
+
+    /**
+     * Returns the slot number in the 32 item grid
+     * @return Slot number from vector (row, column)
+     */
+    public int getSlotNum()
+    {
+        return (int) Math.floor((position.x * 9) + position.y);
+    }
+
+    public void clicked()
+    {
+        callback.run();
+    }
+}

src/main/java/dev/zontreck/libzontreck/chestgui/ChestGUIRegistry.java

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+package dev.zontreck.libzontreck.chestgui;
+
+import dev.zontreck.libzontreck.events.GUIButtonClickedEvent;
+import dev.zontreck.libzontreck.vectors.Vector2;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ChestGUIRegistry
+{
+    public static List<ChestGUI> ActiveGUIs = new ArrayList<>();
+
+    @SubscribeEvent
+    public void onChestGUIButtonClicked(GUIButtonClickedEvent event)
+    {
+        for(ChestGUI gui : ActiveGUIs)
+        {
+            if(gui.isPlayer(event.player))
+            {
+                if(gui.matches(event.id))
+                {
+                    // Handle the click now
+                    CompoundTag tag = event.stack.getTag();
+                    Vector2 pos = new Vector2(tag.getCompound("pos"));
+                    int slot = tag.getInt("slot");
+                    gui.handleButtonClicked(slot, pos, event.stack.getItem());
+                }
+
+            }
+        }
+    }
+}